Now, horse DNA found in burgers at Irish plant, Tesco and Burger King worry
Initial tests on burgers produced by another Irish company, Liffey Meats, also tested positive for low traces of horse DNA, although further tests came back clear.
The minister said the only two other burger manufacturers in the country had both confirmed they have not used any Polish products, and that their products are 100 percent Irish sourced.
He has also asked the police and the fraud squad to join in the investigation and said the government would take legal action against those responsible if necessary.
Silvercrest - a subsidiary of Europe's largest beef exporter ABP Foods which is based just 6 kilometres (3.7 miles) from Rangeland - has lost its contract to supply both Tesco and Burger King with burgers.
Burger King, one of the most popular fast food chains in Britain and Ireland, said last week its affected burgers never reached any eateries. Tesco withdrew a number of products from its shelves, including one sample where horse meat accounted for about 29 percent of content.
Smaller retail chains Aldi, Lidl and Iceland have also sold beef products found to contain horse DNA.
Poland's veterinary authority found no signs of horse meat in samples from five slaughterhouses that were sending beef to Ireland and is awaiting results from the sixth, state news agency PAP reported on Friday.
Food safety experts say horse DNA poses no added health risks to consumers, but the discovery has raised concerns about the food supply chain and the ability to
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